NDLI: Flame Propagation Speed in SI Engines: Modeling and Experimental Assessment

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Baratta, Mirko Andrea, E. Catania Spessa, Ezio Vassallo, Alberto
Copyright Year	2005
Abstract	The necessity for further reductions of in-cylinder pollutant formation and the opportunity to minimize engine development and testing time highlight the need of cycle simulation tools that have to accurately predict the effects of fuel, design and operating variables on engine performance. To develop reliable tools for indicated cycle simulation in SI engines, a correct prediction of heat release is required, which, in turn, involves the evaluation of in-cylinder turbulence generation and flame-turbulence interaction. This can be pursued by the application of a combustion fractal model coupled with semiempirical correlations of available geometrical and thermodynamical mass-averaged quantities. However, in the literature there is a lack of comparisons between the flame propagation speed obtained through these correlations and the experimental data determined under operating conditions that are significant for IC engines running on both conventional and alternative fuels. The present paper develops a new correlation that takes account of the effects of turbulence shrinking on the flame front as well as of the turbulent transfer of both species and heat across the flame front. The procedure has been applied to calculate the burning speeds in the cylinder of a naturally-aspirated bi-fuel engine for a wide range of engine speeds (N = 2000–4600 rpm), loads (bmep = 200–790 kPa), relative air-fuel ratios (RAFR = 0.80–1.30) and spark-advances (SA ranging from 8 deg retard to 2 deg advance with respect to MBT), under both gasoline and CNG operations. The computed burning speeds were compared to those obtained with the correlations currently available in the literature and to the experimental flame propagation data. These latter were extracted from measured in-cylinder pressure by means of a diagnostics technique previously developed by the authors. The results indicate that the burning speeds calculated through the authors’ procedure are in better agreement with the experimental outcomes than those derived from the correlations that are currently available in the literature.
Sponsorship	Internal Combustion Engine Division
Starting Page	193
Ending Page	208
Page Count	16
File Format	PDF
ISBN	0791847365
DOI	10.1115/ICEF2005-1216
e-ISBN	0791837688
Volume Number	ASME 2005 Internal Combustion Engine Division Fall Technical Conference (ICEF2005)
Conference Proceedings	ASME 2005 Internal Combustion Engine Division Fall Technical Conference
Language	English
Publisher Date	2005-09-11
Publisher Place	Ottawa, Ontario, Canada
Access Restriction	Subscribed
Subject Keyword	Cycles Turbulence Spark-ignition engine Combustion Fractals Shrinkage (materials) Fuels Modeling Pressure Engines Stress Design Flames Heat Pollution Simulation Gasoline Internal combustion engines Performance Cylinders Testing
Content Type	Text
Resource Type	Article

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